Article Text

other Versions

PDF
Intermediate microRNA expression profile in Graves’ disease falls between that of normal thyroid tissue and papillary thyroid carcinoma
  1. Matthias Pohl1,
  2. Florian Grabellus1,
  3. Karl Worm1,
  4. Georg Arnold2,
  5. Martin Walz3,
  6. Kurt Werner Schmid1,4,
  7. Sien-Yi Sheu-Grabellus1,5
  1. 1Institute of Pathology and Neuropathology, University Hospital of Essen, University of Duisburg-Essen, Essen, Germany
  2. 2Center of Pathology Essen-Mitte, Essen, Germany
  3. 3Department of Surgery, Center of Minimally Invasive Surgery, Kliniken Essen-Mitte, Essen, Germany
  4. 4Member of the West German Cancer Centre Essen (WTZE), Essen, Germany
  5. 5Institute of Pathology Recklinghausen, Recklinghausen, Germany
  1. Correspondence to Dr Sien-Yi Sheu-Grabellus, Pathologisches Institut Recklinghausen, Mühlenstr. 31, Recklinghausen 45659, Germany; sheu-grabellus{at}pathologie-re.de

Abstract

Aims Many studies have previously reported a higher prevalence of papillary thyroid carcinomas (PTC) in patients with Graves' disease (GD). MicroRNAs (miRNAs) are small, non-coding RNAs that are upregulated in PTC compared with benign thyroid tissue. The objective of the study was to examine the miRNA expression of selected miRNAs that are known to be upregulated in PTC in patients with GD.

Methods Paraffin embedded thyroid tissue from 159 patients with GD was screened for expression of the miRNAs 146b, 181b, 21, 221 and 222 by RT-PCR. The expression profiles of four normal thyroids, 50 PTCs without concomitant GD and 11 patients with untreated GD served as the controls.

Results The expression pattern of these miRNAs in patients with GD is intermediate between that of benign thyroid tissue (p<0.001) and PTC (in three out of five miRNAs, p<0.001). This corresponds to a 15-fold change for GD versus PTC, and a 31-fold change for GD versus normal thyroid tissue. The miRNA expression in 11 papillary microcarcinomas found in our study (a prevalence of 0.07) was not different from that in PTC samples from patients without GD for four of five miRNA types. Furthermore, we found a significant difference in the expression of miRNA 221/222 between treated and untreated GD tissue.

Conclusions In conclusion, we found an intermediate expression of specific miRNAs in thyroid tissue from patients with GD that fell between the expression levels found in normal thyroid glands and PTC, which suggests a possible influence of certain miRNAs on developing PTC in patients with GD.

  • THYROID CANCER
  • HISTOPATHOLOGY
  • MOLECULAR PATHOLOGY

Statistics from Altmetric.com

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.